The Silent Swapper

{x}, {t}, Exile The Silent Swapper: Exile a rare or mythic spell in your graveyard or on the battlefield under your control. Choose a spell on the battlefield or in a graveyard that you don't control. At the end of the game, if you won, trade
the first card for the chosen card. This card is now yours to do as you wish with it. If the owner of that card won, give them the Silent Swapper. Otherwise,